test:
  list:
    - 'a'
    - 'b'
    - 'c'

@Component
@ConfigurationProperties(prefix = "test")
public class TestYML {
 private String[] list;
 public void test(){
  System.out.println("list:"+list);
 }
 ///  set方法不能少
 public void setList(String[] list) {
  this.list = list;
 }
}

@Component
@PropertySource(value = {"classpath:a.yml"}, factory = YamlPropertySourceFactory.class)
@ConfigurationProperties(prefix = "test")
public class TestYML {
 private String[] list; 
 public void test(){
  System.out.println("list:"+list);  
 }
 ///  set方法不能少
 public String[] getList() {
  return list;
 }
}

import org.springframework.boot.env.YamlPropertySourceLoader;
import org.springframework.core.env.PropertySource;
import org.springframework.core.io.support.DefaultPropertySourceFactory;
import org.springframework.core.io.support.EncodedResource;
import java.io.IOException;
import java.util.List;
/**
 * @author KinYang.Lau
 * 用于讀取 yml 類型的文件
 * @date 2020/9/26 7:06 下午
 */
public class YamlPropertySourceFactory extends DefaultPropertySourceFactory {
 @Override
 public PropertySource<?> createPropertySource(String name, EncodedResource resource) throws IOException {
  if (resource == null) {
   return super.createPropertySource(name, resource);
  }
  List<PropertySource<?>> sources = new YamlPropertySourceLoader().load(resource.getResource().getFilename(), resource.getResource());
  return sources.get(0);
 }
}

test:
  list: a.b.c

@Value("#{'${test.list}'.split('.')}")
private String[] list2;